Circles TEST Acc Geo 24-25

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is given by the formula C = 2πr, where r is the radius.

Front

If the radius of a circle is 14 inches, what is the circumference?

Back

C = 2π(14) = 28π inches.

Front

What is a central angle in a circle?

Back

A central angle is an angle whose vertex is at the center of the circle and whose sides intersect the circle.

Front

The measure of a central angle is equal to the measure of its __________.

Back

intercepted arc.

Front

What is the relationship between the diameter and radius of a circle?

Back

The diameter (d) is twice the radius (r), so d = 2r.

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle is given by the formula A = πr², where r is the radius.

Front

What is the measure of an arc in a circle?

Back

The measure of an arc is the degree measure of the angle that subtends the arc at the center of the circle.

Front

If the diameter of a circle is segment ER, what is the radius?

Back

The radius is half of the diameter, so r = ER/2.

Front

What is the relationship between inscribed angles and intercepted arcs?

Back

An inscribed angle is half the measure of its intercepted arc.

Front

If m∠EAB = 116°, what is m∠EDB if EC is a diameter?

Back

m∠EDB = 58° because the angle inscribed in a semicircle is a right angle.